87201982081 has 2 divisors, whose sum is σ = 87201982082. Its totient is φ = 87201982080.

The previous prime is 87201982079. The next prime is 87201982117. The reversal of 87201982081 is 18028910278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75053533681 + 12148448400 = 273959^2 + 110220^2 .

It is a cyclic number.

It is not a de Polignac number, because 87201982081 - 2¹ = 87201982079 is a prime.

It is a super-2 number, since 2×87201982081² (a number of 23 digits) contains 22 as substring.

Together with 87201982079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (87201982031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43600991040 + 43600991041.

It is an arithmetic number, because the mean of its divisors is an integer number (43600991041).

Almost surely, 2^87201982081 is an apocalyptic number.

It is an amenable number.

87201982081 is a deficient number, since it is larger than the sum of its proper divisors (1).

87201982081 is an equidigital number, since it uses as much as digits as its factorization.

87201982081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 46.

The spelling of 87201982081 in words is "eighty-seven billion, two hundred one million, nine hundred eighty-two thousand, eighty-one".